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粉末液相模锻法制备BN增强Al-Cu基复合材料
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北京科技大学

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TG333

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国家高技术研究发展计划(863计划)


Fabrication of Al-Cu Composite Reinforced with BN by Powder Liquid-Phase Forging
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University of Science and Technology Beijing

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    摘要:

    采用粉末液相模锻技术制备出近全致密Al-5.3 wt% Cu-3.0 wt% h-BN复合材料,研究了该技术对复合材料致密化及界面结合状况的影响。采用SEM、XRD、TEM等分析测试手段对球磨前后粉末形貌、复合材料显微组织结构及物相组成进行表征,采用布氏硬度计对复合材料硬度进行测试。结果表明:在大量液相存在的情况下,施加外力可有效促进复合材料的致密化。粗铝粉(35 μm)制备的复合材料晶粒呈细条状,具有方向性,T6热处理后发生原位再结晶;细铝粉(2 μm)制备的复合材料晶粒细小,形貌不明显。复合材料界面由Al/Al2O3/BN组成,清晰可见,结合紧密。复合材料与基体合金相比,硬度提高近15%,细铝粉制备的复合材料硬度比粗铝粉略高。

    Abstract:

    Al-5.3 wt% Cu composite reinforced with 3.0 wt% h-BN with nearly full desification was fabricated by the process of liquid-phase forging. The powder morphology and comparative structural characteristics were analyzed using X-ray diffraction, scanning and transmission electron microscopy, and the composite hardness was measured by Brinell tester. Special attention was paid to the effects of the technique on the densification and the interface bonding of as-forged composites. These revealed the composite densification can be promoted effectively with plenty of embedded liquid phase under pressure. The composites fabricated using aluminium powder with different granularity showed different grain characteristics, and in situ recrystallization occurred inside the original grains with 35 μm aluminium powder. Moreover, a good interface consisted of Al/Al2O3/BN was apparent in the composite. Compared with the basis alloy, the composite hardness was increased nearly by 15%, and the composite with 2 μm aluminium powder showed the better performance.

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陈存广,郭志猛,罗骥,曹慧钦,郝俊杰,叶安平.粉末液相模锻法制备BN增强Al-Cu基复合材料[J].稀有金属材料与工程,2016,45(1):165~170.[chencunguang, guozhimeng, luoji, caohuiqin, haojunjie, yeanping. Fabrication of Al-Cu Composite Reinforced with BN by Powder Liquid-Phase Forging[J]. Rare Metal Materials and Engineering,2016,45(1):165~170.]
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  • 收稿日期:2014-12-06
  • 最后修改日期:2015-05-27
  • 录用日期:2015-07-14
  • 在线发布日期: 2019-01-04
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